Lost my ST13's battery a couple of days ago,,, just came out of the Home Depot,,, pressed the button,, and "what !!",, nothing was left on,, it just gave up suddenly,, as others have found. The solution was to call buddy,, and have him drive over with my battery tender. He has an inverter in his pickup,, so I just powered off that,, and plugged the tender into the power feed that normally runs my electric vest. Actually,,, I run the tender there all the time. 5 minutes on the tender,,, which has a variable max output of about 2amps,,, and Blue STar happily started right up. I put a new battery in the same evening,,, but the event has me thinking about getting a lithium pack for trips. If I could use it by just plugging into the same vest/tender line,,, that would be pretty convenient. Some of the packs have 12v outputs,, for up to 10amps,, which sounds like it would partially charge a flat main battery in 5 to 10 minutes. My tender/vest power line has a 15 amp fuse inline. A bit of wiring work would eliminate the need for using the big battery clamps,, and the need to remove seats and side cowling for battery post access. Also,,, having some portable power would be useful in other ways,,, lighting,, charging devices,, etc ?? Maintaining polarity would be a concern,,, but could be addressed with connector designs. Should work,,, no,,, looking for input,,, Cat'
https://www.amazon.com/gp/product/B01J5G8PF6/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ARYTEB27KZJVB
https://www.amazon.com/gp/product/B01J5G8PF6/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=ARYTEB27KZJVB